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Wrong.. If you have a circle with 100mm Diameter, the radius =50.I got 9 out of 10 (90%) answers correct on SDC Trivia Game #640
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What’s a Picost?
About $6.50
And Pi is radius to circumference, not diameter
Multiply 50X 3.14159 = 157.0795. The circumference is most certainly not 157.0795.
It is the DIAMETER X PI that gives the CIRCUMFERENCE = 314.159